Electrical indicating instrument



Dec. 31, 1929. H. L. TANNER ELECTRICAL INDICATI NG INSTRUMENT Filed April 26, 1926 Patented Dec. 31, 1929 UNITED STATES PATENT OFFICE HARRY I1. TANN OF BROOKLYN, NEW YORK, ASSIGNOR TO THE TANNER ENGINEER- ING COMPANY, INC., OF LONG ISLAND CITY, NEW YORK, A GORPORATIONDF NEW YORK ELECTRICAL INDICATING INSTRUMENT Application filed April 26,

This invention relates to indication-producing instruments. More specifically it relates to instruments which are particularly adapted for use in'telemetric systems.

The object of the invention is to provide novel, accurate, eflicient, and economical indication-producing instruments.

The present application is a continuation in part of my'application Serial No. 552,077, filed April 13, 1922, for United States Letters Patent N 0. 1,587,050, issued June 1, 1926, and

of my application Serial No. 675,428", filed November 17, 1923, both of which contain claims dominating subject matter herein disclosed and claimed.

Referring to the drawings: Fig, 1 is a partially diagrammatic view illustrating one form of my invention applied A in a telemetric system.

FFig. 2 is a section on the line II II of ig. 1.

Fig. 3 is a detail elevation, partly in section, showing another form of indicationproducing instrument. 'Fig. 4 is a View. of the blank from which a part of the instrument shown in Fig. 3 is made.

In Figs. 1 and 2 I have shown a form of indicating instrument shown in Figs. 3 and 4 of my copending application Serial No. 552,07 7, filed April 13, 1922, now United States Letters Patent No. 1,587,050, issued June 1, 1926, except in the present application there is but one coil 129, provided on the U-shaped bar 280 instead of the two coils or tapped winding, 12', 13 in Fig. 3 of application Serial No. 552,077, now Patent No. 1,587 ,050. r I

. Referring to Figs. 1 and 2, a movable element consisting of a soft iron rod 110 is secured to an arm secured to the shaft 114, and extends through the opening of the coil 128. It will be apparent that when the coil 128 is energized, themovable element 110 will be magnetized. The following means are pro- Vided for impressing oppositely acting forces of magnetic repulsion upon the movable cle ment- 110 and for varying the relative strength of such forces.

A pair of soft iron rods 262 and 263 are 50 -fi-xedlv mounted within the' stationary coil adapted to be diagrammatically illustrated in 1926. Serial No. 104,662. P

128, one on either side" of the shaft 114. A stationary U-shaped bar 280 of soft iron is mounted with its opposite ends adjacent the upper ends of the rods 262 and 263.

As stated, in Figs. 3 and 4 of my Patent No. 1,587,050, I show two coils or a tapped wind-,- ing 12, 13, on the U-shaped bar and such an arrangement is within the scope ofone of my claims herein. However, the arrangement herein illustrated is preferable in certain respects and in certain systemsQ In this arrangement illustrated herein I employ a single winding single coil 129 on the U-shaped bar 280. This instrument is particularly employed with the transmitter Fig. 1 and which I shall now briefly describe.

The transmitter comprises a cylindrical rotor 141 of magnetizable materialsecured to a shaft 155 journaled for oscillation about its axis. The shaft 155 may be actuated by a float or other object (not shown) whose position is to be-indicated at a distance by the indicating instrument. The rotor 141 has scoured thereon a coil or winding 65 whose ope posite ends are connected respectively to the opposite ends of the coil 129 of the indicationproducing instrument. Mounted upon the poles 61 and 62, respectively, of the magnetizable stator 142 are coils 63, 64. The coils 63 and 64 are connected in series with each other and in series with the coil 1280f the indicating instrument across an, A. 0. line. I

The coils 63 and 64 are so relatively wound and connected that, when energized, the polarity of the poles 61 and 62 will at all times be opposite to each other. In other -Ar words, alternating magnetic flux will pass between the poles 61 and 62. When the rotor coil-65 is in a neutral position, i. e., in such position that this flux does not pass through the said coil 65, no E. M. F. will be induced in the latter, no current will flow in the said coil 65,'and no current Will flow in the coil 129 at the'indicating instrument. In this case 9 the rod will be repelled alike by the rods 262 and 263 andthe pointer 111 willstand in mid or central position. When the rotor is shifted so that the rotor coil 65 is shifted in one direction or the other from its neutral position an E. M. F. will be induced in the said coil 65, and current will flow through the coils 65 and 129. The instantaneous direc tion of the current flow through the coil 129 with respect to the current flowing through the coil 128 will depend upon which direction the rotor 141 and its coil 65 have been shifted from the neutral position.- The magnitude or strength of the current flows ing through the coil 129 .will depend upon the extent to which the rotor 141 and its coil 65 have been moved from neutral position. When current fiows through the coil 129 the force of repulsion of the rod 263 upon the rod 110 isstrengthened (or weakened) and the force of repulsion of the rod 262 upon the rod 110 is weakened (or strengthened) dependent upon the direction of flow of current through the coil 129 with respect to the direction of flow of current through the coil 128. Theextent to which the 'force ofrepulsion of one of the bars 262, 263 upon the bar 110 is strengthened and the force of repulsion f of the other of said bars 262,. 263 upon the bar 110 is weakened depends upon the magnitude or strength of current flowing through the coil 129 which, asstated, depends upon the extent of deflection of the rotor coil from neutral positionl In short, the scale 113 may be calibrated to indicate, in cooperation with the pointer 111, angular positions of the remotely locatedrotor or movable element 141 or any device connected thereto.

In Figs. 3 and 4 I have shown an indication-producing instrument which is compara-' tiv'ely simple and easy to construct and which has a considerable index-operating torque. In this form of instrument the shaft 214, mounted in suitable journals (not shown) has secured thereto an armature 210 and a pointer or index 211. The latter may cooperate with ascale, such as the scale 113, or may be provided with a stylus or inking pen 86 adapted to trace a record upon arecord sheet (not shown) The armature 210 may convenient- 1y be constructed from a single piece of sheet iron or other magnetizable. material cut, or

stamped to the shape or outline shown in securedthereto lies on the axis of the said shaft 214. e

A stationary cylindrical rod 85 of iron or other magnetizable material, shown in cross-section in Fig. 3, is mounted at right angles to the axis of the coil 128. The coil 128 and the cylinder or.rod 85 are so placed that the armature when in mid -or neutral position extends at right angles to the axis of the cylinder .85 and parallel to the axis of the coil .128. The coil 129 is wound on the cylinder 85 and when energized magnetizes the armature 210and into the cylinder 85,.

or vice versa. When no current is flowing through the coil 129 and current is flowing through the coil 128, the armature 210 will assume a position at right angles to the axis of the cylinder because in that position the air gap between the armature 210 and the cylinder 85 is shortest. In other words, the cylinder. 85 acts as a centralizing device for the armature. If the coil 129 is now energized, the armature 210 will automatical- 1y be shifted to a new position of equilibrium to one side or the other of its neutral position depending upon the direction of flow of current in the coil 129 with respect to the direction of flow of current in the coil 128. Furthermore, when current is caused to flow through the coil 129 the extent of deflectionof the armature 210 from neutral'position will depend upon the strength or magnitude of the current through the coil 129.

The principle of operation of the instrument shown in Fig. 3 is generally the same as that of the instrument shown in Figs. 1 and 2 of my Patent No. 1,587,050, and claims covering the instrument shown in Fig. 3 of the present application will be found in the said patent. The instrument shown in Fig.

Fig. 4 and bent as follows. The fl 74, 74 3 of the present application is, however, an

are bent downwardly on the dotted lines 73,

' 7 3, and the ends 79, 79 bent inwardly on the dotted lines 80, 8t), so that the shaft 214 may be driven through the holes 81, 81, 81. The flap 7 5 is bent upwardly on the dotted line 76 and the end 77 bent to the right on the dotted line 78. It will be noted that the shaft 214 passes through the rear end of the index or pointer 211 and also through the rear end of a member 71 of sheet material used as a counter-weight. The index or pointer, 211, the counter-weight 71 and the arma-- ture 210 are secured together by a rivet 72. The counter-weight is so adjusted the center of gravity of the shaft 214 and the elements improvement over that shown in Figs. 1 and 2 of the said patent in that it employs only one coil 129) on the centralizing bar (85) in-. stead of two coils (12 and 13) on the centralizing bar if The instrument shown in Figs. 3 and 4 may obviously I be substituted for the indicating instrument shown in Fig. 1 by connecting the tions and relations described, some of these may be altered and others omitted and some of the features of each modification may be embodied in the others without interfering with the more general results outlined, and the invention extends to such use.

What I claim is: I q

1. An electrical indicating instrument comprising a magnetizable rotatable mem- 6. An indicating instrument comprising in combination, an indicating couple, a movable armature controlling said couple, a plurality of bars of magnetizable material, a magn'etizing coil for causing one of said bars to repel said armature in one direction and another of said bars simultaneously to repel said armature in the opposite direction, and a single winding. single coil electromagnet controlling the relative magnetic strengths of said bars.

In testimony whereof I hereto aflix my signature.

HARRY L. TANNER.

ber, a coil for magnetizing said member,

magnetic centralizing means for said member adapted to localize the magnetic flux produced by said coil, and a single winding single coil for deflecting the said member in either direction from its normal position.

2. An electrical indicating instrument comprising a magnetizable member, a coil member for magnetizing said member, one

of said. members being rotatable, magnetic centralizing means for said movable member and located in the flux path of said coil member, and a single winding single coil for deflecting said movable member in either direction from its normal position.

3. An electrical indicating instrument adapted for control and energization by an alternating current transmitter comprising in combination, an armature mounted for oscillation about an axis, a polarizing coil surrounding'said armature, magnetizable means including a stationary bar of magnetizable material for centralizing and deflecting said armature inopposite directions and a single winding single coil wound on said bar for creating the magneto-motive force. that causes deflection of the armature.

4. An indicating instrument comprising in combination, an indicating couple, a movable element of magnetizable material controlling said couple, a stationary coil for impressing a magneto-motive force upon said element, and means for magnetically repelling said element in opposite directions to various po sitions of equilibrium, said last mentioned means having only a single winding single coil and which cooperates with said first mentioned stationary coil.

5. An indicating instrument comprisingin combination, an indicating couple, a movable armature controlling said couple, a plurality of bars of magnetizable material, a magnetizing coil for causing one of said bars to repel said armature in one direction and another of said bars simultaneously to repel said armature in the opposite direction, and

an electromagnet controlling the relative magnetic strengths of said bars. 

